By adding sodium sulphide to depress quartz in the cleaning,high grade fluorite concentrate can be gained,whose content of silicon is under 1.0%,grade is over 97% and recovery is higher than 87%.

• 同时采用精选补加硫化钠抑制石英；得到了含硅量低于1.；0%25；品位高于97%25；总回收率高于87%25的高品级萤石。